Lots of questions there, Michelle, so I will try to be brief.
To divide a disk in two, the tool is a centre square like this: http://www.uktoolbox.com/products/fa...iABEgK5KPD_BwE
A centre will be where two or more diameters cross. You can also do this by inserting your disk into a circle template and connecting the marks, but it is not quite as accurate.
Getting the earrings to match is a constant challenge.
For polishing the edges of a disk you can use silicon rubber wheels very lightly on your motor.
For the flat surfaces get Micro mesh, which comes as rubberised abrasive sheets found online and rub the disks on them resting flat on the bench. About four grades will do, starting from the coarsest-2400, then3600 (or 4000), 6000 and 8000 to finish.
https://www.google.co.uk/search?q=mi...NYTc8Aetk4GwAQ Dennis.
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